timezone search causing autopilot failures

Our autopilot tests are failing from the datetime panel. The tests use "London, United Kingdom" as a string to search, which returns no matches. If you type this manually, the suggestions are correct until after entering the comma.

A more obvious example of the issue is searching for "San Antonio, Texas". As you're typing the "San Antonio, Texas" is the top result, once you enter the ", " all the suggestions are cleared except "San Antonio, Tecomitl, Mexico City, Mexico". This makes it impossible to select Texas.

It works fine as long as you pick a result from the selection before the results change, however it's impossible to select very specific searches.